Toxic phosphorus compounds

ABSTRACT

1. A new chemical toxic agent   WHERE R is an alkyl group, where n is from 1 to 10, and where X is selected from the group consisting of   4 AND I .

United States Patent [1 1 Natarelli, Jr. et al.

[4 1 Aug. 19, 1975 TOXIC PHOSPHORUS COMPOUNDS [75] Inventors: Gerard E. Natarelli, Jr., Bel Air, Md.; Frank G. Pinto, Middlesex, N.J.; Jacob I. Miller, Baltimore, Md.

[73] Assignee: The United States of America as represented by the Secretary of the Army, Washington, DC.

[22] Filed: Mar. 13, I963 [21] Appl. No.1 265,594

[56] References Cited FOREIGN PATENTS OR APPLICATIONS 665,315 l/l952 United Kingdom 260/945 Primary E.\'uminerLeland A. Sebastian Attorney, Agent, or Firm-Nathan Edelberg; Robert P.

Gibson; Robert W. Church EXEMPLARY CLAIM l. A new chemical toxic agent where R is an alkyl group, where n is from 1 to 10, and where X is selected from the group consisting of 7 Claims, No Drawings 4 and I TOXIC PHOSPHORUS COMPOUNDS In more detail, the preparation of the dimethiodide of 3- 3'(m-dimethylaminophenoxy)propoxy -5-dime- The invention dQSQTibCd herein y be mill'lufflcthylaminophenyl pinacolyl methylphosphonate (called tured and used by or for the Government of the United g compound EA 2613) is as follows: States of America for governmental purposes without STEP 1. The Preparation of 3- 3-(m-Nitrophenoxy)- the payment to us of any royalty thereon. propoxy -5-nitrophenyl Pinacolyl Methylphosphonate.

This invention relates to a series of new compounds that are extremely useful as chemical warfare agents.

These compounds are toxic because theyhave been H) shown to be extremely potent inhibitors of cholinestero (cH 0- ii ase, and they cause death at very low dosages. In addi- 3 r c] EI3N non, these compounds give evidence that they are re- 0 sistant to the standard atropine-oxime therapy for anticholinesterase poisoning. o CH CH C(CH These compounds can be shown generically as fol- 1 N02 3 3 lows: l H

if -o-(cH )n-o'- OP-O-R .2x

CH N CH where R is an alkyl group, where n is l to 10, and where 0 H X" is selected from the group consisting of 4 and I 2 2 A schematic diagram of the stcp-by-step preparation of these compounds is as follows: Ill

i To a stirred'suspension of 3.34 g. (0.01 moles) of la; I o (3 nitrophenoxy)-3-(3-hydroxy-5-nitrophenoxylproo (CH O r pane (l) in 50 ml. of dry hexane was added a solution .2 3 7.. o P of 1,01 g. (0.01 moles) of dry triethylami-negin 10 ml. of v I I i l l dry hexane. The mixture .was heated to reflux on a 5 Y 3 steam bath in an attempt to enhance the-solution ofthe I N(CIH phenol. To the stirred, refluxing mixture was added a 3 3 3 3 solution of 2.0 g. (0.01 m) of pinacolyl methylphosphonochloridate (ll) in ml. of dry hexane. After the The alcoholic solution of 3-[ 3-(m-aminophenoxy)- addition, which required one-half hr., the reaction m'ixl0 propoxyj-5-aminophenyl pinacolyl mgttlIiylphosplhonatg ture became cloudy. The stirred mixture was then re- (IV) was placed in a round bottome as an mixe fluxed for 3 hrs., cooled, and filtered to yield the theowith '19 g.- (0.132 m0les, a 5 molar excess) of methyl retical amount of solid triethylamine hydrochloride. i dide and 3-.7- g. {-0.035 moles, twofold excess) of so- The filtrate was then stripped of solvent under reduced di b te, The mixture was stirred at room tempressure to yield a small quantity of a yellow oil which erature for '1 day and refluxed gently for 2 days. The would not crystallize. This oil was redissolved in 50 ml. hot reaction mixture was filtered free of carbonates and of benzene and Washed in the Order wn, with 50 ml. the solvent was removed from the clear orange filtrate each of cold water, cold 1 N aqueous sodium hydroxder reduced pressure. and Cold Water. The nz n olution Wa th n I The tan solid residuewas treated with chloroform to dried over Drierite and stripped of solvent under rese arate' the insoluble sodium iodide from the desired duced Pressurfl The residual y ll Oil was pumped producLThe sodiumiodide was removed by filtration. down to 2 ,uHg. and heated at 150 for 2 hr. This oil was The chloroform filtrate was evaporated to dryness found tO n yz Well for the expected p t II- A under reduced pressure and the crude tan solid product Small Sample decomposed Without dishllatioh at 2200/2 was recrystallized from ethanol-ethyl acetate to yield I 0.8 g. of a fine yellow powder, m.p. l 24l26.

Anal. Calcd. for C H N O P: C, 53.2; H, 5.9; N, A l, Calcd. for C ,,H, N O Pl C, 43.3; H, 6.1

5,6. 7 Found: c, 43.2; H, 6.2.

Found! N, I The preparation of the dimethotetraphenylboronate STEP TheIPreparation 0f -Amin p'h noxy) 30 salts of these compounds was accomplished by pouring p p ylm phenyl Pin COlyl Methylphosphona concentrated aqueous solution of the desired dimethiodide, with vigorous swirling into a solution of so- 0 CH O CH. ll H I 3 -O-(CH -O- -0-P o CH -O(CH O -o-P OCH I CH c(c|-| I cH C(CH l l 1 j I No N02 NH NH Ill IV A solution of 2.2 g. (0.0044 moles) of 3-[3-(m-nitrodium-tetraphenylborate The product precipitated imphenoxy)propoxyl-S-nitrophenyl pinacolyl methylmediately as an extremely fine white powder that was phosphonate h 50 of absolute nol Was refiltered with difficulty. Recrystallization of these crude duced in 8 pp t s er a 5% platinum on charproducts was accomplished by preparing a saturated coal catalyst at60 p.s.i:g. the theoretical amount of hy-' solution of the desired crude compound in acetone, drogen was taken up'in 3 hrs. The mixture wea filtered and pouring this, with vigorous swirling, into a large free of catalyst and the clear yellow alcoholic solution volume of cold water. Allowing the resulting mixture to was used immediately in the Subsequent q erniza- I stand-overnight at room temperature enhanced the cotloh- I agulation of the precipitated product, which could then STEP 3. The, Preparation of the Dimethiodide of 3- be filtered and dried at room temperature. [3-(m-Dimethylaminophenoxy)propoxyI-S-dime- The compounds that have been prepared and tested thylaminophenyl Pinacolyl y p ph n are listed below by code number, name and chemical O CH cH I -O(CH -O- -O-P-O- CH- Nu CO N( H l r I NW structure. The physical and chemical properties and the physiological data are summarized the inclo sd table. I in EA 2012 3- 4-( m-Dimethylaminophenoxy )butoxy 5-dimethylamii1ophenyl lsopropyl Methy lphosphonate 5 Dimethotetraphenylboronate EA 2034 3-[3-(m-Dimethylaminophenoxy)propox yl-5-dimethylaminophenyl lsopropyl Methylphosphonate Dimethotetraphenylboronate EA 2098 3-l3-(m-Dimethylaminophenoxy)propoxyl-S-dimethylaminophenyl Ethyl Mcthylphosphonate Dimethotetraphenylboronatc EA 2613 3-[3-m-Dimethylaminophenoxy)propoxyl- S-dimethylaminophenyl Pinacolyl Methylphosphonate Dimethiodide Melting Analysis Molecular. point Solubilwcight C ity Empirical Formula Code Number EA 2012 171-172 Sol. ac

lnsol.

H 0 501. ac lnsol.

H O Sol. ac lnsoL Sol.

H O ale, ac CHCL,

EA 2098 c m a o m p 1105 108-111 g miemuram Kg Kilogram weight of the animal L0,, [he dosage required to kill of the animals ac acetone ale alcohol IV LD Calculated for Found pg/kg. C H H N Rats Rabbits -o (CH )n o N(CH W3 where R is an alkyl group, where n is from 1 to 10, and where X is selected from the group consisting of 4 and l 2. A new chemical toxic agent where R is ethyl, where n is from 1 to 10, and where X- is selected from the group consisting of 4 and l 3. A new chemical toxic agent -O-P-O-R 4 and I 4. A new chemical toxic agent as set forth by the following formula i CH3 c CH 5. A new chemical toxic agent as set forth by the following formula 6. A new chemical toxic agent as set forth by the following formula Nl l G) 7. A new chemical toxic agent as set forth by the following formula o l o-R u 45 CH3 CH c CH N(CH 3 3 3 3 3 N(CH W3 where R is isopropyl, where n is from 1 to l(), and 2 I 6 where X is selected from the group consisting of 

1. A NEW CHEMICAL TOXIC AGENT
 2. A new chemical toxic agent
 3. A new chemical toxic agent
 4. A new chemical toxic agent as set forth by the following formula
 5. A new chemical toxic agent as set forth by the following formula
 6. A new chemical toxic agent as set forth by the following formula
 7. A new chemical toxic agent as set forth by the following formula 